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diff --git a/www/wiki/mw-config/index.php b/www/wiki/mw-config/index.php
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+<?php
+// phpcs:disable Generic.Arrays.DisallowLongArraySyntax
+/**
+ * New version of MediaWiki web-based config/installation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+// Bail on old versions of PHP, or if composer has not been run yet to install
+// dependencies. Using dirname( __FILE__ ) here because __DIR__ is PHP5.3+.
+// phpcs:ignore MediaWiki.Usage.DirUsage.FunctionFound
+require_once dirname( __FILE__ ) . '/../includes/PHPVersionCheck.php';
+wfEntryPointCheck( 'mw-config/index.php' );
+
+define( 'MW_CONFIG_CALLBACK', 'Installer::overrideConfig' );
+define( 'MEDIAWIKI_INSTALL', true );
+
+// Resolve relative to regular MediaWiki root
+// instead of mw-config subdirectory.
+chdir( dirname( __DIR__ ) );
+require dirname( __DIR__ ) . '/includes/WebStart.php';
+
+wfInstallerMain();
+
+function wfInstallerMain() {
+	global $wgRequest, $wgLang, $wgMetaNamespace, $wgCanonicalNamespaceNames;
+
+	$installer = InstallerOverrides::getWebInstaller( $wgRequest );
+
+	if ( !$installer->startSession() ) {
+		if ( $installer->request->getVal( "css" ) ) {
+			// Do not display errors on css pages
+			$installer->outputCss();
+			exit;
+		}
+
+		$errors = $installer->getPhpErrors();
+		$installer->showError( 'config-session-error', $errors[0] );
+		$installer->finish();
+		exit;
+	}
+
+	$fingerprint = $installer->getFingerprint();
+	if ( isset( $_SESSION['installData'][$fingerprint] ) ) {
+		$session = $_SESSION['installData'][$fingerprint];
+	} else {
+		$session = array();
+	}
+
+	if ( !is_null( $wgRequest->getVal( 'uselang' ) ) ) {
+		$langCode = $wgRequest->getVal( 'uselang' );
+	} elseif ( isset( $session['settings']['_UserLang'] ) ) {
+		$langCode = $session['settings']['_UserLang'];
+	} else {
+		$langCode = 'en';
+	}
+	$wgLang = Language::factory( $langCode );
+	RequestContext::getMain()->setLanguage( $wgLang );
+
+	$installer->setParserLanguage( $wgLang );
+
+	$wgMetaNamespace = $wgCanonicalNamespaceNames[NS_PROJECT];
+
+	$session = $installer->execute( $session );
+
+	$_SESSION['installData'][$fingerprint] = $session;
+}